Question: a pharmaceutical product drug is sterilized by passing through a...
A pharmaceutical product (drug) is sterilized by passing through a 10m long tube with diameter 12.7mm. The drug, flowing at a speed of 0.2m/s enters the tube at 25C and exits at 75C. The heating is affected by application of a uniform heat-flux. The drug properties are density = 1000kg/m3, Cp=4kJ/kg-K, mew = 2(10-3)kg/s-m, k=0.48W/m-K, and Pr = 10. The flow enters the tube fully developed hydraulically, but with uniform temperature profile (i.e., not thermally fully developed).
a) What is the required heat-transfer . (Ans. 12,682W/m2)
b) What is the tube surface temperature at the tube exit? (Ans. 152C)
c) What is the tube surface temperature at location x=0.5m ? Hint: Estimate the Nusselt number via Figure 8.10 (Incropera and Dewitt) in the thermally-developing region for constant heat-flux.